floridakeys.noaa.gov · Official Sanctuary
Sanctuary area rules, depth, and reef structure.
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Shallow, protected reef with easy boat access and reliable marine life; boat traffic and sanctuary rules are the main planning constraints.
About Sombrero Reef
Sombrero Reef is a shallow spur-and-groove reef off Marathon in the Florida Keys, protected as a Sanctuary Preservation Area and marked by Sombrero Key Light. It is a classic boat-access site for snorkeling and easy reef diving, with clear, warm water, dependable reef life, and a strong beginner-friendly profile, but boat traffic and sanctuary rules matter.
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Research Estimate At Sombrero Reef
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 25m
AccessSimple entry
CoralMixed health
Aquatic LifeGreat variety
FacilitiesGood facilities
Crowd / PopularityModerate
CurrentNo current
SurgeFlat calm
Where Is Sombrero Reef?
This spotNearby spotsExplore nearby spots on the map
Community sourced coordinates.
Sombrero Reef Planning Details
Depth range, seasonality, and planning context.
Reported Depth
7m - 9m
Depth Note
Depths inside the SPA stay under 30 feet, with a representative reef depth around 7 m.
Best Season
Year-round; April-July are favored, while winter remains accessible and October-November are quieter.
Typical Conditions
Shallow spur-and-groove reef with clear, warm water and limited currents, but subject to boat traffic and sanctuary rules.
Safety & Access At Sombrero Reef
Hazards, restrictions, and access requirements.
Key Hazards
Restricted access
Safety Notes
Watch boat traffic and stay aware of the Sanctuary Preservation Area rules.
Access Restrictions
Designated SPA area.
Legal Notes
Special regulations apply here; use moorings and follow sanctuary guidance.
Local Intel For Sombrero Reef
Community notes to help plan your visit.
Scuba Diving
The shallow reef and limited currents make Sombrero Reef a good fit for beginner scuba, especially on a guided boat with local knowledge.
Freediving
Snorkelers and freedivers can enjoy the shallow reef in calm conditions, but the best experience comes from a guided boat run that respects sanctuary rules.
Snorkeling
Identified as a Florida Keys snorkeling destination.
Wildlife at Sombrero Reef
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Sombrero Reef
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Sombrero Reef
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility25m
Activity
No dive activity logged yet.
